linux-kernel - [PATCH v15 6/7] drm/ingenic: dw-hdmi: make hot plug detection work for CI20

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Message-Id: <88297a6ddd9d9eaf78c605e23030b7877bb521d8.1644681054.git.hns@goldelico.com>
Date:   Sat, 12 Feb 2022 16:50:54 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Paul Boddie <paul@...die.org.uk>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Paul Cercueil <paul@...pouillou.net>,
        Maxime Ripard <maxime@...no.tech>,
        Harry Wentland <harry.wentland@....com>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-mips@...r.kernel.org,
        letux-kernel@...nphoenux.org
Subject: [PATCH v15 6/7] drm/ingenic: dw-hdmi: make hot plug detection work for CI20

There is no hpd-gpio installed on the CI20 board HDMI connector.
Hence there is no hpd detection by the connector driver and we
have to enable polling by the dw-hdmi driver.

We need to set .poll_enabled but that struct component
can only be accessed in the core code. Hence we use the public
setter function drm_kms_helper_hotplug_event().

Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
index 34e986dd606cf..90547a28dc5c7 100644
--- a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
+++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
@@ -55,6 +55,8 @@ ingenic_dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
 	if (mode->clock > 216000)
 		return MODE_CLOCK_HIGH;
 
+	dw_hdmi_enable_poll(hdmi, true);
+
 	return MODE_OK;
 }
 
-- 
2.33.0